Fix custom scalar value-type support

src/StrawberryShake/CodeGeneration/src/CodeGeneration/RuntimeTypeInfo.cs

@@ -34,6 +34,11 @@ public RuntimeTypeInfo(string name, string @namespace, bool isValueType = false)
 
         public string Namespace { get; }
 
+        public string FullName =>
+            Namespace == "global::"
+                ? Namespace + Name
+                : Namespace + "." + Name;
+
         public string NamespaceWithoutGlobal =>
             Namespace.Replace("global::", string.Empty);
 

src/StrawberryShake/CodeGeneration/src/CodeGeneration/TypeInfos.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Diagnostics;
 using StrawberryShake.CodeGeneration.Analyzers.Types;
 using static StrawberryShake.CodeGeneration.TypeNames;
 
@@ -103,14 +104,27 @@ public class TypeInfos
             { TimeSpanSerializer, new RuntimeTypeInfo(TimeSpanSerializer) }
         };
 
-        public RuntimeTypeInfo GetOrCreate(string fullTypeName, bool valueType = false) =>
-            _infos.TryGetValue(fullTypeName, out RuntimeTypeInfo? typeInfo)
-                ? typeInfo
-                : new(fullTypeName, valueType);
+        public RuntimeTypeInfo GetOrAdd(string fullTypeName, bool valueType = false) =>
+            GetOrAdd(fullTypeName, () => new(fullTypeName, valueType));
 
-        public RuntimeTypeInfo TryCreate(RuntimeTypeDirective runtimeType) =>
-            _infos.TryGetValue(runtimeType.Name, out RuntimeTypeInfo? typeInfo)
-                ? typeInfo
-                : new(runtimeType.Name, runtimeType.ValueType ?? false);
+        public RuntimeTypeInfo GetOrAdd(RuntimeTypeDirective runtimeType) =>
+            GetOrAdd(runtimeType.Name, () => new(runtimeType.Name, runtimeType.ValueType ?? false));
+
+        private RuntimeTypeInfo GetOrAdd(string fullTypeName, System.Func<RuntimeTypeInfo> factory)
+        {
+            if (!fullTypeName.StartsWith("global::"))
+            {
+                fullTypeName = "global::" + fullTypeName;
+            }
+
+            if (!_infos.TryGetValue(fullTypeName, out RuntimeTypeInfo? typeInfo))
+            {
+                typeInfo = factory();
+                Debug.Assert(typeInfo.FullName == fullTypeName, $"Expected generated type '{typeInfo.FullName}' to equal '{fullTypeName}'.");
+                _infos.Add(fullTypeName, typeInfo);
+            }
+
+            return typeInfo;
+        }
     }
 }

src/StrawberryShake/CodeGeneration/src/CodeGeneration/Utilities/SchemaHelper.cs

@@ -95,7 +95,7 @@ public static RuntimeTypeInfo GetOrCreateTypeInfo(
             this ISchema schema,
             string typeName,
             bool valueType = false) =>
-            ((TypeInfos)schema.ContextData[_typeInfosKey]!).GetOrCreate(typeName, valueType);
+            ((TypeInfos)schema.ContextData[_typeInfosKey]!).GetOrAdd(typeName, valueType);
 
         private static void CollectScalarInfos(
             IEnumerable<ScalarTypeExtensionNode> scalarTypeExtensions,
@@ -308,7 +308,7 @@ private static void TryRegister(TypeInfos typeInfos, RuntimeTypeDirective? runti
         {
             if (runtimeType is not null)
             {
-                typeInfos.TryCreate(runtimeType);
+                typeInfos.GetOrAdd(runtimeType);
             }
         }
     }

src/StrawberryShake/CodeGeneration/test/CodeGeneration.CSharp.Tests/ScalarGeneratorTests.cs

@@ -51,6 +51,16 @@ public void Custom_Scalar_With_RuntimeType() =>
                 "extend scalar Email @runtimeType(name: \"global::System.Int32\")",
                 "extend schema @key(fields: \"id\")");
 
+        [Fact]
+        public void Custom_Scalar_With_RuntimeType_ValueType_AsInput() =>
+            // Using System.Index here because it exists and is not part of the default TypeInfos
+            AssertResult(
+                "query SetPerson($email: Email!) { person { setEmail(email: $email) } }",
+                "type Query { person: Person }",
+                "type Person { setEmail(email: Email!): Email! }",
+                "scalar Email",
+                "extend scalar Email @runtimeType(name: \"global::System.Index\", valueType: true)");
+
         [Fact]
         public void Custom_Scalar_With_Unknown_RuntimeType() =>
             AssertResult(